I couldn't read every post, because there are too many of them, but there is one point nobody seems to know.I can say with certanty that the shutdown problem is hardware related.Not only it happens to Mac OS 10.4.6 and .7, as it also happens to Windows and Linux installed in a Macbook. I've been using them because I am a developer and I needed too (although I must say I love Mac OS).I haven't seen any post at any forum that I have searched in Google saying this, but it also happens to those OSes.I just think I'm really f... up because I bought my Macbook from Amazon and I live in Brazil. It will take much time for me to repair it, because the peaces are imported. And I might not be that lucky and changing the logical board might not do the trick.

Ooooh, I almost forgot!!! Did I mention that my Macbook had a shutdown DURING the SMC firmware update? I guess I need lots of prayers!Yes, it shows me it is the latest update now, but should I believe it is OK? I can't reset it nor reinstall the update.

Just thought I'd add a positive post to this thread and say that a month after repair for random shutdowns, my MacBook is still running like a charm (knock on wood). Now, they did replace a lot more than the logic board, so I am not sure what parts being replaced really did the trick. Good luck to anyone with their MacBooks in repair. I know it's a pain in the rear, but they're so worth it!

GuyKuo, great work. Just two more things: in my case, RSD have happened only with the computer is cold, after a full night for instance, and when turning it on, not waking it up from sleep. I haven't turned it off since Saturday morning, and although I got a kernel panic (apparently the USB modem got crazy with line noise) it hasn't shut down again. Neither the PRAM reset or the firmware update have made much difference.

The other thing: the log consistently reports a -82 message when shutting down. Some other fellow "sufferers" have reported a -72, and my impression is that the -72 are related to warm conditions, but I may be way out.

My shutdown problem is getting worse. I start up in 1,0GHz mode and when heated up, I used to let the machine sleep and wake up again for the full speed but that doesn't work anymore. After awakening with the temerature stil on about 50 degr C it also shuts down. Most of the time immediately, sometimes after a while.So my MacBook now has become useless at normal speed.I'd thought I'd wait for a fimware update and/or a real hardware solution from Apple, but in the state it has now become I want to bring it in for repair.I heard a rumour that Apple has come with a new and working motherboard.Can anyone confirm this?

I started having the random shutdown problem yesterday afternoon. I reset the PMU, then started having the colored lines on boot problem. The fix about resetting the PRAM, then changing the screen resolution has worked.

On the 28/8/06 I handed in my Black Macbook to Next Byte (Apple reseller and repair centre) in Broadway Sydney, they changed the logic board and messaged me today on the 31/8/06 that it was ready for pick up. I went into the the Next Byte store on Glebe Point Rd and they handed me my “repaired” MacBook. I opened it in the store and turned it on. I tested it in the store by opening 3-4 avi movies I had on my HDD and what do you know?? IT SHUT DOWN AGAIN!!! I showed the apple sale consultant and he wasn't impressed...I then restarted and performed the xterm "yes >/dev/null &" test. It was performing well, but I was skeptical because I thought I may have pressed the power button too long causing the processor to be capped at 1GHz. So I shut it down without any problems. Then I went to restart it and it wouldn't go passed the initial grey screen, after a while it starting having different coloured vertical lines and this is the current state of every restart…

The Sales guys were very nice, understanding and helpful. They said I should get it replaced but as I hadn’t bought it from that store they couldn't replace it so I had to call Apple customer care and sort it out with them.

I called apple care and spoke with a tech support guy for a bit and was then passed on to a customer care rep who heard my story, gave me a new case number and instructions to take it back to the repair store with orders that the tech diagnostic guy should call him with the details....

I requested a replacement but he said that he couldn't authorise that now because it must go through more diagnostics before he can pass it on for replacement approval...

So here begins week 2 without my computer and 5 days away from my thesis draft due date...

By the way, do any NSW Australians know how the consumer protection laws are applicible in this situation? When I was speaking with the customer care rep, I said that by law I'm entiled to a refund and he said that isn't true. But from reading

Hi Bocha! your repair is too quick, i just sent mine today at a different apple reseller and they told me to wait for 10 business days. oh well. im too tired already to be angry.

i read the dept of fair trading. i cannot see any loop hole considering our case. if you decided to push thru with it, please let us know. it will be very helpful to fellow australians here having the same scenario.

It's been two week since the replacing of the logic board, I can say that I have had no random shutdowns.

The combination of the new logic board + the firmware upgrade have done the trick. Much cooler computer and the fan comes up more often than it did before.

I was able now to install "windows/boot camp" in a 5Gb partition and it works perfectly too. The fan also runs a lot on windows and it also keeps cool, I've run an app in windows and the temp is very similar to what core duo temp reports in OS X. In windows the computer goes also goes to sleep too ok.

On the 28/8/06 I handed in my Black Macbook to NextByte (Apple reseller and repair centre) in BroadwaySydney, they changed the logic board and messaged metoday on the 31/8/06 that it was ready for pick up. Iwent into the the Next Byte store on Glebe Point Rdand they handed me my “repaired” MacBook. I opened itin the store and turned it on. I tested it in thestore by opening 3-4 avi movies I had on my HDD andwhat do you know?? IT SHUT DOWN AGAIN!!! I showed theapple sale consultant and he wasn't impressed...Ithen restarted and performed the xterm "yes

/dev/null &" test. It was performing well, but I was

skeptical because I thought I may have pressed thepower button too long causing the processor to becapped at 1GHz. So I shut it down without anyproblems. Then I went to restart it and it wouldn'tgo passed the initial grey screen, after a while itstarting having different coloured vertical lines andthis is the current state of every restart…

The Sales guys were very nice, understanding andhelpful. They said I should get it replaced but as Ihadn’t bought it from that store they couldn'treplace it so I had to call Apple customer care andsort it out with them.

I called apple care and spoke with a tech support guyfor a bit and was then passed on to a customer carerep who heard my story, gave me a new case number andinstructions to take it back to the repair store withorders that the tech diagnostic guy should call himwith the details....

I requested a replacement but he said that hecouldn't authorise that now because it must gothrough more diagnostics before he can pass it on forreplacement approval...

By the way, do any NSW Australians know how theconsumer protection laws are applicible in thissituation? When I was speaking with the customer carerep, I said that by law I'm entiled to a refund andhe said that isn't true. But from reading

"Consumers and traders may negotiate other solutions such as a repair or replacement but under these circumstances a consumer has a legal right to cancel a contract (rescind) and receive a refund if there is a breach of that contract.

Where a dispute arises between a consumer and a trader, the Office of Fair Trading can negotiate with the parties to achieve an acceptable solution. However, Fair Trading is unable to direct the parties to a particular course of action. Only a court or tribunal is empowered to make a determination in such circumstances."

Apple could attempt to negotitate a repair or replacement, and if you disagree it would be sent to arbitration. Even if that fails you would have to take it to court to enforce you refund. It could be a long and expensive road to get a refund if Apple insists on the repair route.

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